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The performance of cross-linked magnetic chitosan, coated with magnetic fluids and cross-linked with epichlorohydrin, was investigated for the adsorption of copper (II) from aqueous solutions. Infrared spectra of chitosan before and after modification showed that the coating and cross-linking are effective. Experiments were performed at different pH of solution and contact time, and appropriate conditions for the adsorption of Cu(II) were determined. Experimental equilibrium data were correlated with Langmuir and Freundlich isotherms for determination of the adsorption potential. The results showed that the Langmuir isotherm was better compared with the Freundlich isotherm, and the uptake of Cu(II) was 78.13 mg8226;g-1. The kinetics of adsorption corresponded with the first-order Langergren rate equation, and Langergren rate constants were determined. 相似文献
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以酸性黑染料废水为处理对象,对多相催化氧化处理工艺中的铜系催化剂进行研究。结果表明:各种载体中以活性炭、α—Al2O3、γ—Al2O3为载体制得铜催化剂的活性较高;负载量越大,COD及色度去除率越大;在酸性黑染料废水降解初期会引起COD和色度急剧增大。增大的多少及达到极值点的时间与所用催化剂紧密相关。 相似文献
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负载型杂多酸催化剂的制备及光催化性能研究 总被引:1,自引:0,他引:1
采用浸渍法和微波法相结合,制备负载型杂多酸光催化剂H3PMo12O40/TiO2。在紫外光照射下,研究对模拟染料废水酸性蓝溶液的光催化降解的影响。结果表明,H3PMo12O40/TiO2比单独的H3PMo12O40光催化性能好,〖JP2〗在初始浓度10 mg·L-1酸性蓝溶液、m(H3PMo12O40)∶m(TiO2)=1∶3、催化剂加入量为90 mg·L-1、pH=1.05、30%的H2O2用量10 mL·L-1和180 min条件下,脱色率达93%以上。 相似文献
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提出了一种制备Y掺杂TiO2薄膜的新方法。采用溶胶-凝胶法结合超声技术,以钛酸四丁酯为前驱体制备Y-TiO2溶胶,分别采用XRD、SEM、FT-IR和UV-vis对样品的组成与结构进行了表征。结果表明:Y3+掺杂可较好地抑制TiO2由锐钛矿相向金红石相的相变,提高了相变温度,抑制了晶粒生长。Y掺杂TiO2薄膜的晶型结构为锐钛矿相结构,晶型为锐钛矿相,粒度为6~16nm。Y3+掺杂能引起TiO2光学吸收边的"红移",带隙变窄,红移程度随掺杂量增加而增大,随温度升高而减小。薄膜表面平整,厚度约80nm。 相似文献
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